Lightest of all known substances
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HYDROGENLightest of all known substances.
HYDROGENThe lightest of all known substances.
LITHIAOxide of the lightest known metal.
lithiuma soft silver-white element of the alkali metal group that is the lightest metal known and that is used especially in alloys and glass, in chemical synthesis, and in storage batteries see element table
HYDROGENLightest known substance
METALLithium is the lightest one known